IA-32 architecture
opcode groups




 
mod R/M
 
xx000xxx xx001xxx xx010xxx xx011xxx xx100xxx xx101xxx xx110xxx xx111xxx
group #1
(80..83h)
 
ADD
 
OR ADC SBB AND SUB XOR CMP
group #2
(C0..C1h)
(D0..D3h)
ROL ROR RCL RCR SHL SHR SAL* SAR
group #3
(F6..F7h)
TEST
Ib/Iv
TEST*
Ib/Iv
 
NOT
 
NEG MUL
AL/eAX
IMUL
AL/eAX
DIV
AL/eAX
IDIV
AL/eAX
group #4
(FEh)
 
INC Eb
 
DEC Eb
group #5
(FFh)
 
INC Ev
 
DEC Ev CALL Ev CALL Mp JMP Ev JMP Mp PUSH Ev
group #6
(0Fh,00h)
SLDT Mw
SLDT Gv
STR Mw
STR Gv
LLDT Mw
LLDT Gv
LTR Mw
LTR Gv
VERR Mw
VERR Gv
VERW Mw
VERW Gv
JMPE
Ev
(IA-64)
group #7
(0Fh,01h)
 
SGDT Ms
 
SIDT Ms LGDT Ms LIDT Ms SMSW Mw
SMSW Gv
LMSW Mw
LMSW Gv
INVLPG M
(80486+)
group #8
(0Fh,BAh)
 
BT
 
BTS BTR BTC
group #9
(0Fh,C7h)
CMPXCHG
Mq
(see CPUID)
group #10
(8Fh)
 
POP Ev
 
group #11
(0Fh,B9h)
 
UD2
 
UD2 UD2 UD2 UD2 UD2 UD2 UD2
group #12
(C6h)
(C7h)
MOV
group #13
(0Fh,71h)
PSRLW
Pq,Ib (MMX)
(66h) PSRLW
Vo,Ib (SSE2)
PSRAW
Pq,Ib (MMX)
(66h) PSRAW
Vo,Ib (SSE2)
PSLLW
Pq,Ib (MMX)
(66h) PSLLW
Vo,Ib (SSE2)
group #14
(0Fh,72h)
PSRLD
Pq,Ib (MMX)
(66h) PSRLD
Vo,Ib (SSE2)
PSRAD
Pq,Ib (MMX)
(66h) PSRAD
Vo,Ib (SSE2)
PSLLD
Pq,Ib (MMX)
(66h) PSLLD
Vo,Ib (SSE2)
group #15
(0Fh,73h)
PSRLQ
Pq,Ib (MMX)
(66h) PSRLQ
Vo,Ib (SSE2)
 
 
(66h) PSRLDQ
Vo,Ib (SSE2)
PSLLQ
Pq,Ib (MMX)
(66h) PSLLQ
Vo,Ib (SSE2)
 
 
(66h) PSLLDQ
Vo,Ib (SSE2)
group #16
(0Fh,AEh)
FXSAVE
M512
(see CPUID)
FXRSTOR
M512
(see CPUID)
LDMXCSR
Md
(SSE)
STMXCSR
Md
(SSE)
LFENCE
(SSE2-MEM)
MFENCE
(SSE2-MEM)
CLFLUSH M
(see CPUID)
SFENCE
(SSE-MEM)
group #17
(0Fh,18h)
PREFETCH-
NTA M
(SSE-MEM)
PREFETCH-
T0 M
(SSE-MEM)
PREFETCH-
T1 M
(SSE-MEM)
PREFETCH-
T2 M
(SSE-MEM)
HINT_NOP
M
(P6+)
HINT_NOP
M
(P6+)
HINT_NOP
M
(P6+)
HINT_NOP
M
(P6+)



note: The opcodes marked with * are aliases to other opcodes.



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